Module 1 Periodicity: Period 3 Atomic Radius Nuclear charge increases Outer electrons attracted more NO additional shielding

Module 1 Periodicity: Period 3 First Ionisation Complicated! General increase as nuclear charge increases

Module 1 Periodicity: Period 3 Electronegativity Number of protons increases Attraction of electrons increases

Module 1 Periodicity: Period 3 Melting Point Na,Mg,Al Metallic Si Macromolecular P,S,Cl Simple mol Ar Atomic

Module 1 Periodicity: Period 3 Boiling Point Na,Mg,Al Metallic Si Macromolecular P,S,Cl Simple mol Ar Atomic

Module 1 Periodicity: Group II Atomic Radius Increase in number of shells Outer most electrons further From nucleus

Module 1 Periodicity: Group II First Ionisation Atomic radius increases Outer most electrons become shielded

Module 1 Periodicity: Group II Electronegativity Size of ion increases Size to charge ratio decreases Covalent character of compounds decreases

Module 1 Periodicity: Group II Melting Point All metallic Charge to size ratio decreases Less attraction to delocalised electrons Be,Mg hexagonal close packed Ca,Sr face centred cubic Ba body centred cubic http://www.facstaff.bucknell.edu/kastner/univ281/Crystalline%20materials.htm